To send a message from a specific source process to a specific destination process, it is necessary for the source process to know the destination TID (task identification) or rank and for the...

To send a message from a specific source process to a specific destination process, it is necessary for the source process to know the destination TID (task identification) or rank and for the destination to know the source TID or rank. Explain how each process can obtain the TID or rank of the other process in MPI. Give a program example.